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1·He postulated that the carbon reacts initially with the sulfate to form calcium sulfide.

他认为碳最初和硫酸钙反应生成硫化钙。

2·This invention relates to a novel method for producing calcium sulfide from phosphogypsum or other gypsum.

本发明涉及一种用磷石膏或其它石膏生产硫化钙的新方法。

3·The high combustion temperatures melt together the coal ash (largely silica and alumna) and calcium sulfide solids to form an inert slag that drains from the bottom of the boiler.

高温燃烧使得炭灰(富含硅和铝)和硫化钙熔为一体，从而产生固体残渣，从锅炉底部溢出。

4·The roasting process of copper sulfide concentrate in the presence of calcium carbonate is studied by using the differential thermal analysis (DTA), thermogravimetric (TG) and X-ray diffraction.

通过DTA和TG结合X 射线衍射分析的方法，将硫化铜精矿加碳酸钙焙烧与硫化铜精矿焙烧的反应机理进行了对比研究。

5·SEM and TEM examination showed that the graphite in low carbon ductile iron formed nucleus and grew up based on the sulfide and oxide of manganese and calcium.

结果表明：低碳球墨铸铁中的石墨是以锰、钙等的硫化物与氧化物作为基底形核并长大形成的。

6·To improve the homogeneity of manganese sulfide and calcium fluoride, the machinability could be enhanced.

改善硫化锰和氟化钙的分布，将会改善切削加工性。

7·The oxide inclusions can be enveloped by sulfide inclusions thus improving machinability of B30 steel through calcium treatment.

通过钙的变性处理，B30钢中的氧化物被硫化物所包裹，从而进一步改善钢的切削加工性。